Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
cong ban » cong bang, cong san, cong tan
ban thai » ban than, ban thi, ban tai
thai cao » tai cao, thoai cac, thuat cao
tung va » tuong va, dung va, cung va
vung va » dung va, luong va, duong va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - thanh ((((tung va) OR (vung va))) or (trung va)) dung cong ban thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh ((((tung va) OR (vung va))) OR (trung va)) dung cong ban thai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((((tung va) OR (vung va))) or (trung va)) dung cong ban thai cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((((tung va) OR (vung va))) or (trung va)) dung cong ban thai cao*.